From 25a0aee77e086aa15026c01293630756c8547382 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bora=20=C3=96zgen?= <oezgen@nantis.de>
Date: Mon, 15 Feb 2021 09:56:06 +0100
Subject: [PATCH] Support RTC from HSE only for STM32F2/3/4

---
 targets/TARGET_STM/rtc_api_hal.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/targets/TARGET_STM/rtc_api_hal.h b/targets/TARGET_STM/rtc_api_hal.h
index eaf57fccd9..da5576ad2a 100644
--- a/targets/TARGET_STM/rtc_api_hal.h
+++ b/targets/TARGET_STM/rtc_api_hal.h
@@ -38,6 +38,10 @@
 extern "C" {
 #endif
 
+#if RTC_FROM_HSE && !(TARGET_STM32F2 || TARGET_STM32F3 || TARGET_STM32F4)
+#error "RTC from HSE not supported for this target"
+#endif
+
 #if RTC_FROM_HSE
 #define RTC_CLOCK 1000000U
 #elif MBED_CONF_TARGET_LSE_AVAILABLE